Table 2 Change in patient reported outcomes from baseline to 12 months after surgery. Postive values indicate clinical improvement, negative values indicate a worsening. The patients are divided into four groups according to their preoperative Numeric Rating Scale (NRS) –score for lower extremity pain
Improvement from baseline after 12 months follow up | Group 1 NRS = 0–2 n = 154 | Group 2 NRS = 3–5 n = 753 | Group 3 NRS = 6–8 n = 1766 | Group 4 NRS = 9–10 n = 528 | p-value |
|---|---|---|---|---|---|
ODI mean (SD) | 8.2 (15.0) | 11.4 (14.2) | 16.7 (17.5) | 23.7 (20.9) | p < 0.05a |
Back-pain mean (SD) | 0.71 (2.83) | 1.62 (2.59) | 2.69 (2.90) | 3.79 (3.40) | p < 0.05a |
Leg-pain mean (SD) | −1.08 (2.75) | 1.40 (2.63) | 3.53 (2.96) | 4.95 (3.41) | p < 0.05a |
EQ -5D mean (SD) | 0.12 (0.24) | 0.15 (0.29) | 0.27 (0.37) | 0.38 (0.42) | p < 0.05a |